Fueling & Injection Fuel Pumps | Injectors | Rails | Regulators | Tanks

Fuel system planning

Thread Tools
 
Search this Thread
 
Old Sep 10, 2017 | 07:11 PM
  #1  
cypris09's Avatar
Thread Starter
Launching!
iTrader: (1)
 
Joined: Sep 2014
Posts: 228
Likes: 6
Default Fuel system planning

Hey all, it will be a while till I get to this stage of my build but I figured I could get some planning done now and maybe snag a few deals off the classifieds. The build I'm planning on running with is a basically stock 5.3 custom grind cam, speed engineering A body long tubes and a torquestorm supercharger. They're rated around 6 to 8 psi. Some claim around 10 psi.
The car is a 1968 pontiac lemans. So here's my few questions. What size injectors, and what size pump? Do I get just a plain regulator or a boost referenced one? As far as the pump goes, in line vs in tank? I have yet to take my tank out but just by looking at it, it looks pretty good and wouldn't mind keeping it. Not sure if there's an easy tank from another car or something I can just swap in and use that as iv just not done alot of research on that thus far. Anyways any help would be appreciated. Thanks for your time
Reply
Old Sep 11, 2017 | 02:18 PM
  #2  
JoeNova's Avatar
Restricted User
 
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Default

In tank vs external is preference. In tank it quieter and more expensive if you don't already have a tank setup for it.

Referenced vs not referenced is preference as well. If your injectors are large enough to not need the extra fuel pressure, then you shouldn't be that worried about referencing it.

Any injectors over 60 lbs or pump 340 lph or more will do fine.
Reply
Old Sep 12, 2017 | 07:44 AM
  #3  
cypris09's Avatar
Thread Starter
Launching!
iTrader: (1)
 
Joined: Sep 2014
Posts: 228
Likes: 6
Default

Originally Posted by JoeNova
In tank vs external is preference. In tank it quieter and more expensive if you don't already have a tank setup for it.

Referenced vs not referenced is preference as well. If your injectors are large enough to not need the extra fuel pressure, then you shouldn't be that worried about referencing it.

Any injectors over 60 lbs or pump 340 lph or more will do fine.
That definitely helps alot. Thank you. I keep seeing injectors for sale most of them are 60 lbs. Maybe I'll just go 80 just to be safe. Just to clarify are the truck injectors the "short" or "long" style. I know you can get adapter for the plugs but I plan in running the truck intake.
Reply
Old Sep 13, 2017 | 08:28 AM
  #4  
01ssreda4's Avatar
TECH Senior Member
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (96)
 
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Default

-6 line, 340 or 450 pump, 80lb injectors, referenced aeromotive FPR.
Reply
Old Sep 15, 2017 | 08:09 PM
  #5  
Lonnies Performance's Avatar
LS1TECH Sponsor
iTrader: (16)
 
Joined: Feb 2007
Posts: 2,662
Likes: 2
From: Pittsburgh, PA
Default

If you are upgrading your fuel system, go straight to a -8 supply line... especially with any pump over 255lph.
Reply
Old Sep 17, 2017 | 03:55 PM
  #6  
cypris09's Avatar
Thread Starter
Launching!
iTrader: (1)
 
Joined: Sep 2014
Posts: 228
Likes: 6
Default

Originally Posted by Lonnies Performance
If you are upgrading your fuel system, go straight to a -8 supply line... especially with any pump over 255lph.
Is that just for feed only? What about return?
Reply
Old Sep 18, 2017 | 08:36 AM
  #7  
01ssreda4's Avatar
TECH Senior Member
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (96)
 
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Default

I did 8 feed and return just so I had only one sized line and fittings to buy.
Reply
Old Sep 18, 2017 | 10:28 AM
  #8  
G Atsma's Avatar
TECH Senior Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 22,291
Likes: 3,616
From: Central Cal.
Default

Good idea! Keeps things less complicated.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Sep 18, 2017 | 03:23 PM
  #9  
cypris09's Avatar
Thread Starter
Launching!
iTrader: (1)
 
Joined: Sep 2014
Posts: 228
Likes: 6
Default

Originally Posted by 01ssreda4
I did 8 feed and return just so I had only one sized line and fittings to buy.
I have noticed that some pumps are 6 an some are 8. All depending on how big of a pump I go. If the pump comes out as 6 an. Should I just stay 6 an or just get like a 6 to 8 and just roll with that.
Reply
Old Sep 18, 2017 | 04:28 PM
  #10  
01ssreda4's Avatar
TECH Senior Member
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (96)
 
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
Default

I guess stay with 6
Reply




All times are GMT -5. The time now is 07:29 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE